Back wired mounting system for static control

ABSTRACT

A back wired static control system including one or more base receptacles supported on a mounting rail, the base receptacle having one or more wire wrap terminals each comprising a wire wrap pin secured to a terminal nut and terminal, the wire wrap terminal being positioned on the base receptacle such that the wire wrap pin extends through an opening provided therefor in the base receptacle, and the wire wrap pin protruding through to the rear of the base receptacle and mounting track such as to be easily accessible for making suitable connection thereto when the base receptacle is assembled to the mounting rail so as to be supported thereby.

United States Patent Chace et al.

[54] BACK WIRED MOUNTING SYSTEM FOR STATIC CONTROL [72] Inventors: Richard L. Chace, Bloomington; Burton 0. Haun, Normal, bothof Ill.

[73] Assignee: General Electric Company [22] Filed: June 11, 1971 [211 App]. No.: 152,222

[52] US. Cl ..339/33, 339/121, 339/126 R, 339/147 P, 339/192'R, 339/263 R, 339/275 [51] Int. Cl. ..I-I01r 13/12 [58] Field of Search..339/l47, 126, 276 A, 220, 221, 339/194, 192, 198 G, 263, 33, 126, 121

[56] References Cited UNITED STATES PATENTS 2,450,873 10/1948 Antony, Jr. ..339/194 R [15] 3,702,983 r451 Nov. 14, 1972 2,916,721 12/1959 Adams ..339/l47 P 2,959,762 11/1960 Schlee ..339/276 A X Primary Examiner-Richard E. Moore Att0meyPhilip L. Schlamp, et a1.

[57] ABSTRACT A back wired static control system including one or more base receptacles supported on a mounting rail, the base receptacle having one or more wire wrap terminals each comprising a wire wrap pin secured to a terminal nut and terminal, the wire wrap terminal being positioned on the base receptacle such that the wire wrap pin extends through an opening provided therefor in the base receptacle, and the wire wrap pin protruding through to the rear of the base receptacle and mounting track such as to be easily accessible for making suitable connection thereto when the base receptacle is assembled to the mounting rail so as to be supported thereby.

10 Claims, 6 Drawing figures PATENTEDNHV 14 I972 I 3. 702 983 INVENTORS RICHARD L. CHACE.

BURTON O. HAUN By HM: yaw),

A TORNEY BACK WIRED MOUNTING SYSTEM FOR STATIC CONTROL BACKGROUND OF THE INVENTION 1 Field of the Invention Our invention relates to static control systems, and more particularly to an improvement in the manner in which wiring connections are made'thereto.

2. Description of the Prior Art As modern industrial equipment has become more and more complex an attendant need has arisen in many instances for providing such equipment with the means whereby a greater number of relay functions are capable of being performed during the course of controlling and operating the industrial equipment. The provision of means for performing a greater number of relay functions has however enhanced the changes for failure of the industrial equipment resulting in expensive downtime thereof.

In an efiort to minimize the potential for such failure, the prior art has turned more and more to the employment in the control and operation of industrial equipment to static control systems. Such systems provide a method of electrically controlling machines and processes with transistorized logic elements and accessories that are not subject to wear. That is, logic elements are intended to accomplish the same job in static control that relays do in a conventional control system. Inasmuch as there are no moving parts in a static control system, the life thereof is independent of the number of operations. Although the potential applications for static control have proven to be many, it is particularly ideal for use where 1) reliable operation is vital, (2) extremely fast operation or many operations per minute are required, (3) extremely infrequent but emergency operation may be required, (4) shutdowns cannot be tolerated, and (5) adverse environmental conditions exist which could cause conventional control to malfunction.

Normally, although the various logic elements utilized in any given logic control system may differ from each other insofar as concerns the specific logic functions the element is to perform, each of the individual logic elements is nevertheless provided with a similarly configured mounting base. Commonly the mounting bases for these logic elements have substantially the same external dimensions and are provided with a plugin construction wherein a plurality of pins or prongs project outwardly from the mounting base. Further, in accordance with conventional practice, a suitable control panel is customarily provided for supporting thereon the components of a given logic control system and for enabling a plurality of input, output and power connections to be made to the logicelements. The control panel in turn is generally housed in a suitable metallic box-like enclosure.

One form of control panel assembly which has been used for the above purpose by the prior art is illustrated in US. Pat. No. 2,916,721 issued to C. J. Adams and assigned to the same assignee as the present invention. As provided therein the control panel assembly includes a control panel, one or more mounting rails suitably supported on the control panel, and one or more base receptacles suitably supported on the mounting rail and having a socket for receiving an individual logic element. Each of the base receptacles is provided with a plurality of pin receiving terminals in its upper surface for receiving the pins projecting outwardly from the base of a logic element. In addition, the upper surface of the base receptacle is further provided with a plurality of wire connecting terminals for making wiring connections thereto.

Accordingly, as exemplified by theteaehings of the aforesaid patent it has been customary to wire static control from the front of the panel with spade connectors used under screw down terminals. One main disadvantage of such a front wiring scheme is that sufficient space must be provided between the rows of base receptacles in order to provide access for bringing wires into juxtaposed position to the wire connecting terminals and also to enable one to insert a suitable tool therebetween in order to loosen and/or tighten the screws of the wire connecting terminals. With industrial equipment becoming increasingly complex such as to require more and more logic functions to be performed for its control and operation, the aforementioned disadvantage of front wired static logic control systems has necessitated the employment of larger and larger control panels in order to mount a. sufficient number of logic elements.

OBJECTS OF THE INVENTION It is therefore an object of the present invention to provide a novel and improved mounting system for static control which has the capability of being wired from the rear.

It is another object of the present invention to provide such a mounting system for static control which permits the rows of individual logic elements to be positioned much closer together such that the density of individual logic elements capable of being mounted on a given size control panel has been substantially increased.

A further object of the present invention is to provide such a mounting system for static control which is capable of accommodating prior art forms of individual logic elements and/or base receptacles without modification of the latter.

A still further object of the present invention is to provide such a mounting system for static control which enables wire wrap connections to be made thereto.

Yet another object of the present invention is to provide such a mounting system for static control wherein in addition to having the capability of being wired from the rear thereof also provides the capability of permitting temporary wiring connections to be made to the front thereof.

Yet a further object of the present invention is to provide such a mounting system for static control which is relatively inexpensive to manufacture, easy to assemble, and provides ready accessibility to the wire connecting terminals thereof.

SUMMARY OF THE INVENTION means for affixing thereto one or more base receptacles. Each of the base receptacles includes at least one wire wrap terminal comprising a wire wrap pin secured to a terminal nut and terminal. The wire wrap terminal is positioned on the base receptacle such that the wire wrap pin extends through an opening provided therefor in the base receptacle. Further, with the base receptacle assembled to the mounting rail so as to be supported thereby, the wire wrap terminal is positioned on the base receptacle such that the wire wrap pin extends through the base receptacle as well as the mounting rail to the rear thereof so as to be readily accessible for making back wired connections thereto.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a perspective view of a mounting rail and a plurality of base receptacles in accordance with the present invention with the base receptacles being illustrated in a disassembled slightly spaced relation to the mounting rail;

FIG. 2 is a top plan view of a base receptacle in accordance with the present invention;

FIG. 3 is a bottom plan view of the base receptacle of FIG. 2 in accordance with the present invention;

FIG. 4 is a side view of a wire wrap terminal employed in the base receptacle in accordance with the present invention;

FIG. 5 is a side view of the wire wrap pin and terminal nut assembly of the wire wrap terminal of FIG. 4 in accordance with the present invention; and

FIG. 6 is a side view of the terminal of the wire wrap terminal of FIG. 4 in accordance with the present invention.

DESCRIPTION OF A PREFERRED EMBODIMENT Referring to FIG. 1 of the drawing, the invention as illustrated therein comprises a mounting system for static control, generally designated by reference numeral 10, and including a mounting rail 11 and a plurality of base receptacles 12. The base receptacles 12 are adapted to be mounted alongside one another in a row on mounting rail 1 1. Although the mounting rail 1 1 is illustrated in FIG. 1 has a length sufficient to accommodate a total of four base receptacles 12, it is to be understood that the length of the mounting rail 11 may be increased or decreased such as to accommodate thereon a greater or lesser number of base receptacles 12. Further it is to be understood that although the mounting rail 1 1 may have a length sufficient to accommodate a given number of base receptacles 12 thereon such as for example a total of four base receptacles 12 as illustrated in FIG. 1, it is nevertheless also possible in accordance with the present invention to mount less than this given number of base receptacles 12 on the mounting rail 1 l at any given time without adversely affecting the operation of the mounting system for static control.

The mounting rail 11 comprises an elongated substantially U-shaped metallic member made preferably of steel and having a U-shaped medial portion 13. The U-shaped medial portion 13 of mounting rail 11 comprises a central portion 13a and a pair of integrally formed flanges 13b and 13c extending outwardly from central portion 13a. Preferably the downwardly extending bottom edges of flanges 13b and 130 as viewed with reference to FIG. 1 are rounded off, to ensure that should these surfaces be made accidentally to rest on a portion of a wire the latter will not be cut or damaged as a result thereof.

The central portion 13a of mounting rail 11 is provided with an opening 16 extending substantially the entire length and width of medial portion 13. As illustrated in FIG. 1 of the drawing, a series of projections 16a extend inwardly into the opening 16 at suitably spaced intervals along the length of medial portion 13. Although projections 16a are depicted only along one side of medial portion 13 in FIG. 1 of the drawing, it is to be understood that a similar number of projections 16a (not shown) are also provided along the other side of medial portion 13 positioned in opposed relation to the projections 16a shown. The series of projections 16a provided along both sides of medial portion 13 serve to divide the opening 16 of central portion 13a into a plurality of smaller compartment-like openings 17. As shown in FIG. 1, there are a total of four such compartment-like openings 17. It is to be understood however that the number of compartment-like openings 17 can vary in accordance with changes in the length dimension of mounting rail 11.

Each of the projections 16a is provided with an opening 18 for a purpose to be described hereinafter. At either end medial portion 13 is preferably provided with an outwardly extending projection 19, only one of which is shown in FIG. 1 of the drawing. Both of the projections 19 are suitably provided with an elongated aperture 20 intended to serve the function set forth later hereinbelow.

With reference further to FIG. 1 of the drawing, it can be seen that each base receptacle 12 preferably has a rectangular horizontal cross-section and a T-shaped vertical cross-section with a central stem portion 21 and outer opposite side portions 22. A rectangular cavity 23 extends from the top surface of the base receptacle 12 and down along the central stern portion 21 and over substantially the entire length of the base receptacle 12. A ridge or key 24 projects into cavity 23 along one side wall.

The upper surface of each base receptacle 12 on opposite sides of cavity 23 contain unit connecting terminals preferably in the form of prong receiving terminals 25 best seen in FIG. 6. As illustrated in FIG. 4, the terminals 25 are located in substantially rectangular apertures 26 immediately beneath inlet holes 27. These prong receiving terminals 25 are designed to make connection to correspondingly located prong-like elements extending downwardly from the base of a logic control unit (not shown) of the type described and illustrated for example in the aforementioned U.S. Pat. No. 2,916,721.

It should be further noted that the front or upper surface of base receptacle 12 within cavity 23 likewise contains unit connecting terminals preferably in the form of prong receiving terminals 25. These latter prong receiving terminals 25 accommodate prongs upon a projection portion of the base in the abovereferenced logic control units (not shown). This projecting portion is configured to fit within the cavity 23 in the manner best described and illustrated in U.S. Pat. No. 2,916,721, and contains a keyway which accommodates key 24 of socket 23 thereby to ensure proper location and orientation of the logic control unit on the base receptacle 12 during plug-in.

Wire wrap terminals 28 for making connection to the outer logic control unit connecting terminals are located along the lower side comers of the outer side portion of each base receptacle 12. These wire wrap terminals 28 as best illustrated in FIG. 5 include a wire wrap pin 29 extending downwardly as viewed with reference to FIG. 5 and a terminal or weld nut affixed to the wire wrap pin 29 by suitable means such as for example by welding.

Referring to FIGS. 1 and 4 of the drawing, a plurality of recessed chambers 31 separated by partitions 32 are provided along the outer edge on both sides of each base receptacle 12. Each of the wire wrap terminals 28 I is positioned along the under surface of base receptacle 12 in juxtaposed relation to the underside of one of the recessed chambers 31. With the wire wrap terminal 28 so positioned, the wire wrap pin 29 thereof projects outwardly away from the base of the base receptacle 12 in a down-wardly direction, and the weld nut 30 of the wire wrap terminal 28 extends through an opening 33 provided for this purpose in base receptacle 12 so that the end of weld nut 30 projects at least slightly into one of the recessed chambers 31.

For a purpose to be described more fully hereinafter, the weld nut 30 of wire wrap terminal 28 is preferably internally threaded. The weld nut 30 of each wire wrap terminal 28 traps and makes connection to a laterally extending offset arm 34 of the prong receiving terminal 25. In fastening weld nut 30 to the extension portion 34 of prong receiving terminal 25, the weld nut 30 is inserted through the aperture provided for this purpose in the offset arm 34 and through the aforedescribed opening 33 in base receptacle 12. The weld nut 30 is then spun over at the top against the upper surface adjacent the circumference of the opening 33 in one of the recessed chambers 31 thereby to securely fasten the prong receiving terminal 25 as well as the wire wrap terminal 28 to the base socket 12 in the manner best understood with reference to the illustration thereof in FIG. 4 of the drawing.

Additional wire wrap terminals 28 for making connection with the centrally located prong receiving terminals 25 are located along the underside of the stem portion 21 of the base receptacle 12. These terminals 28 are essentially identical in structure and configuration to the previously described wire wrap terminals 28 located along the lower side corners of the outer side portions 22 of each base receptacle 12.

Referring to FIGS. 2 and 3 of the drawings, it will be understood therefrom that these additional wire wrap terminals 28 are positioned in juxtaposed relation to the under surface of stem portion 21 of base receptacle 12 such that the wire wrap pins 29 of the wire wrap terminals 28 project outwardly from the stem portion 21 in a substantially perpendicular direction relative thereto, and such that the weld nut 30 of each of these wire wrap terminals 28 extends through a suitable opening (not shown) provided for this purpose in the stem portion 21 of base receptacle 12 so that the end of weld nut 30 projects at least slightly into the cavity 23. In the same manner as described previously hereinabove, weld nut 30 is fastened to the laterally extending offset arm34 of one of the centrally located prong receiving terminals 25. That is, the weld nut 30 is inserted through the aperture 35 provided for this purpose in the offset arm 34 and through the aforementioned opening (not shown) in stem portion 21. Thereafter, the weld nut 30 is spun over at the top against the upper surface adjacent the circumference of the opening through the stem portion 21 thereby to securely fastenthe prong receiving terminal 25 as well as the wire wrap terminal 28 to the stem portion 21 of base receptacle 12. It will be noted that the spun over upper ends of the weld nuts 30 of the wire wrap terminals 28 connected to the centrally locatedprong receiving terminals 25 are located within cavity 23.

The base receptacles 12 may be mounted to the mounting rail 11 by any suitable means. Preferably however, each base receptacle 12 is mounted to the mounting rail 11 by means of a pair of screws (not shown) extending through openings 36 provided for this purpose in base receptacle 12 and suitable openings 18 located in projections 16a of mounting rail ILOpenings 18 may be internally threaded to receive the aforementioned screws (not shown) or else suitable screw receiving nuts may be employed in association with the screws to securely mount the base receptacle 12to the mounting rail 1 1.

To mount the mounting rail 11 on a support such as a control panel or other suitable surface, screws (not shown) may be inserted through the elongated apertures 20 provided for this purpose in the projections 19 (only one shown) at either end of the medial portion 13 of mounting rail 11. It is to be understood that such screws or other suitable form of fasteners would be received in suitable openings provided for this purpose in the control panel. The latter openings could either be internally threaded or else other suitable means such as nuts could be employed in association with the screws.

Turning now to a description of the method of assembly of the mounting system 10 for static control, the prong receiving terminals.25 and the wire wrap terminals 28 are first fastened to the base receptacle 12. This is accomplished in the manner previously described hereinabove wherein the weld nut 30 of a wire wrap terminal 28 is inserted through the aperture 35 provided for this purpose in the offset arm 34 of one of the prong receiving terminals 25. With the wire wrap terminal 28 and the prong receiving terminal 25 so assembled, the weld nut 30 is inserted into either one of the aforedescribed openings provided for this purpose in the stern portion 21 of the base receptacle 12 or through one of the openings 33 provided in the base receptacle 12. In the case of the former, the top of the weld nut 30 projecting into the cavity 23 is thereafter spun over at the top to securely fasten the prong receiving terminal 25 as well as the wire wrap terminal 28 to the stem portion 21 of the base receptacle 12. In the case of the latter, the top of the weld nut 30 projecting through opening 33 into one of the recessed chambers 31 similarly is spun over at the top thereby securely fastening the prong receiving terminal 25 and the wire wrap terminal 28 to the base receptacle 12. With the desired number of prong receiving terminals 25 and wire wrap terminals 28 so fastened to the base receptacle 12 such that the wire wrap pins: 29 of the wire wrap terminals 28 extend outwardly from the base receptacle 12 at substantially right angles thereto and withthe prong receiving terminals 25 properly positioned to receive the prongs of a suitable logic control unit, the base receptacle 12 is mounted to the mounting rail 11 by suitable means (not shown) passing through openings 36 in base receptacle 12 and being received in the openings 18 provided for this purpose in mounting rail 1 1. It will be understood that with the base receptacle 12 so mounted to the mounting rail 11, the wire wrap pins 29 will extend through opening 16 in the mounting rail 11 so as to be readily accessible for making wire wrap connections thereto from the underside, i.e., back, of the mounting rail 11. Finally, suitable fastening means (not shown) may be inserted through elongated apertures for mounting the mounting rail 11 with one or more base receptacles 12 secured thereto to a control panel or other desired surface. In accordance with conventional practice, a plurality of mounting rails 11 arranged in parallel relation to each other are intended to be mounted in closely spaced relation on a suitable control panel, with the latter thereafter being placed in a suitable box-like metallic enclosure.

Occasionally during the course of normal usage, it may be found desirable to make connections of a temporary nature from the front of the base receptacle 12. This may be accomplished by utilizing the internally threaded weld nuts 30 which are accessible from the front of the base receptacle 12. That is, suitable screws (not shown) may be threaded into one or more of the weld nuts 30 and wires connected thereto. It is thus seen that the wire wrap terminals 28 provide the base receptacle 12 with the dual capability of being back wired as well as permitting wire connections to be made from the front thereof.

Thus, in accordance with the present invention there has been provided a novel and improved mounting system for static control which has the capability of being wired from the back. It is thereby possible to position the rows of individual logic elements much closer together such that the density of individual logic elements capable of being mounted on a given control panel has been substantially increased. Moreover this has been accomplished while at the same time retaining in the subject mounting system the capability of accommodating prior arts forms of individual logic elements and/or base receptacles without modification of the latter. Further the mounting system for static control facilitates the making of wire connections inasmuch as wire wrap connections are capable of being made thereto. In addition, the subject mounting system has the dual capability of being wired either from the back or from the front where such connections are intended to be only preferably of a temporary nature. Finally such a mounting system for static control has been provided which is relatively inexpensive to manufacture, easy to assembly, and which provides easy accessibility to the wire connecting terminals thereof.

While only one embodiment of our invention has been shown, it will be appreciated that many modifications thereof may readily be made by those skilled in the art. For example, as was indicated earlier, although only mounting rail 11 has been illustrated having mounted thereon a total of four base receptacles 12, it is to be understood that multiples of mounting rails 11 are generally employed in association with each other and with more or less than four base receptacles 12 mounted thereto. Similarly, each of the base receptacles 12 may be provided with a greater or lesser number of wire wrap terminals 28 and prong receiving terminals 25 than that which is illustrated in the drawings of the instant application. We therefore intend by the appended claims to cover the above modifications as well as all other modifications which fall within the true spirit and scope of our invention.

What we claim as new and desire to secure by Letters Patent of the United States is: l

l. A mounting system for static control comprising:

a. a mounting rail comprising an elongated member, said elongated member including a medial portion, said medial portion having an opening therein;

b. at least one base receptacle mounted to said mounting rail, said base receptacle including a top surface, a stem portion and a pair of outer opposite side portions;

c. terminal assembly means comprising prong receiving terminal means for receiving a prong of a logic control unit and wire wrap terminal means for making wire connections thereto;

. said prong receiving terminal means comprising a prong receiving portion and a laterally offset arm projecting outwardly from said prong receiving portion, said laterally offset arm having an opening therein;

. said wire wrap terminal means comprising a weld nut and a wire wrap pin joined to said weld nut, said weld nut being received in said opening in said laterally offset arm for interconnecting said wire wrap terminal means .to said prong receiving terminal means;

f. means fastening said terminal assembly means to said base receptacle with said prong receiving portion of said prong receiving terminal means accessible from the front of said base receptacle, and with said weld nut of said wire wrap terminal means accessible from the front of said base receptacle and with said wire wrap pin of said wire wrap terminal means projecting outwardly from the rear of said base receptacle; and

g. said wire wrap pin of said wire wrap terminal means extending through said opening in said medial portion of said mounting rail when said base receptacle is mounted to said mounting rail in order to provide access to said wire wrap pin from the rear of said base receptacle and of said mounting rail for making a back wired connection to said wire wrap pin.

2. A mounting system for static control as set forth in claim 1 wherein:

a. said base receptacle has a cavity extending from said top surface down into said stem portion;

b. said stem portion has at least one opening extending entirely through said stem portion and accessible from said cavity; and

. said terminal assembly means is fastened in said opening in said stem portion of said base receptacle with said prong receiving portion of said prong receiving terminal means and said weld nut of said wire wrap terminal means being accessible through said cavity, and with said wire wrap pin extending through said opening in said stem portion and projecting outwardly from the rear of said stem portion at substantially right angles thereto.

3. A mounting system for static control as set forth in claim 1 wherein:

a. said base receptacle includes at least one recessed chamber formed in at least one of said pair of outer opposite side portions;

b. said recessed chamber has an opening extending from said recessed chamber entirely through said base receptacle; and

c. said terminal assembly means is fastened in said opening in said recessed chamber of said base receptacle with said prong receiving portion of said prong receiving terminal means and said weld nut of said wire wrap terminal means being accessible through said recessed chamber and with said wire wrap pin extending through said opening in said recessed chamber and projecting outwardly from the rear of said base receptacle at substantially right angles thereto.

4. A mounting system for static control comprising:

a. a mounting rail comprising an elongated member,

said elongated member including a substantial U- shaped medial portion;

b. said medial portion having an opening therein extending substantially the entire length and width of said medial portion, said medial portion including a plurality of projections arranged in spaced opposed relation along a pair of opposing'sides of said opening and extending inwardly into said opening to divide said opening into a plurality of smaller compartment-like openings;

c. at least one base receptacle, said base receptacle including a top surface, a stem portion, and a pair of outer opposite side portions;

d. said base receptacle and at least some of said plurality of projections on said medial portion including receiver means for receiving mounting means for mounting said base receptacle to said medial portion of said mounting rail, said base receptacle being mounted in juxtaposed relation to portions of a pair of said plurality of smaller compartmentlike openings on said medial portion;

e. a plurality of terminal assembly means, each of said terminal assembly means comprising prong receiving terminal means for receiving a prong of a logic control unit and wire wrap terminal means for making wire connections thereto;

f. each of said prong receiving terminal means comprising a prong receiving portion and a laterally offset arm projecting outwardly from said prong receiving portion, said laterally offset arm having an opening therein;

g. each of said wire wrap terminal means comprising a weld nut and a wire wrap pin joined to said weld nut, said weld nut being received in said opening in said laterally offset arm for interconnecting said wire wrap terminal means to said prong receiving terminal means; and

h. means fastening said plurality of terminal assembly means to said base receptacle with said prong receiving portion of said prong receiving terminal means accessible from the front of said base receptacle, and with said weld nut of said wire wrap terminal means accessible from the front of said base receptacle and with said wire wrap pin of said wire wrap terminal means projecting outwardly from the rear of said base receptacle and through said portions of said pair of said plurality of smaller compartment-like openings on said medial portion of said mounting rail to provide access for making a back wired connection to said wire wrap pin.

5. A mounting system for static control as set forth in claim 4 wherein:

a. said base receptacle has a cavity extending from said top surface down into said stem portion;

b. said stern portion has a plurality of openings extending through said stem portion and accessible from said cavity; and

. at least some of said plurality of terminal assembly means are fastened in said plurality of openings in said stem portion of said base receptacle with said prong receiving portion of said prong receiving terminal means of said at least some of said plurality of terminal assembly means and said weld nut of said wire wrap terminal means of said at least some of said plurality of terminal assembly means being 6. A mounting system for static control as set forth in claim 4 wherein:

a. said base receptacle includes a plurality of recessed chambers formed in said pair of outer opposite side portions;

. each of said plurality of recessed chambers has an opening extending from said recessed chamber entirely through said base receptacle; and

. at least some of said plurality of terminal assembly means are fastened in said opening of said plurality of recessed chambers of said base receptacle with said prong receiving portion of said prong receiving terminal means of said at least some of said plurality of terminal assembly means and said weld nut of said wire wrap terminal means of said at least some of said plurality of terminal assembly means being accessible through said plurality of recessed chambers, and with said wire wrap pin of said wire wrap terminal means of said at least some of said plurality of terminal assembly means extending through said opening in said plurality of recessed chambers and projecting outwardly from the rear of said base receptacle at substantially right angles thereto.

A mounting system for static control comprising: a mounting rail comprising an elongated member,

said elongated member including a substantially U-shaped medial portion;

. said medial portion having an opening therein extending substantially the entire length and width of said medial portion, said medial portion including a plurality of projections arranged in spaced opposed relation along a pair of opposing sides of said opening and extending inwardly into said opening to divide said opening into a plurality of smaller compartment-like openings;

. a plurality of base receptacles, each of said base receptacles including a top surface, a stem portion, and a pair of outer opposite side portions;

d. each of said plurality of base receptacles and each of said plurality of projections on said medial portion including receiver means for receiving mounting means for mounting said plurality of base receptacles to said medial portion of said mounting rail, each of said plurality of base receptacles being mounted in juxtaposed relation to portions of a pair of said plurality of smaller compartmentlike openings on said medial portion;

ing terminal means accessible from the front of said base receptacles, and with said internally threaded weld nut of said wire wrap terminal means accessible from the front of said base recepand with said wire wrap pin of said wire wrap terminal means of said at least some of said plurality of terminal assembly means extending through a angles thereto. 9. A mounting system for static control as set forth m claim 7 wherein:

a. each of said plurality of base receptacles includes a plurality of recessed chambers formed in said pair of outer opposite side portions;

. a plurality of terminal assembly means for each of eacfipf g of reaessed g g i an said plurality of base receptacles, each of said Plugfg g gt g g zg i pzgfifi g am rahty of l l @Z i conlpllsmg c. at least some of said plurality of terminal assembly prong ricewmg ermm l recewmg a means for each of said plurality of base receptacles prfmg o a loglc colltml P and i wrap 15 are fastened in said opening of said plurality of minal means for making wire connections thereto; recessed chambem with Said prong receiving pop of Sand prong F teimmal means tion of said prong receiving terminal means of said pnsmg 8 prong recelvmg pomon and a laterally at least some of said plurality of terminal assembly offse} fl g outwardly from Said 9 means and said weld nut of said wire wrap terminal said laterally offset arm havmg means of said at least some of said plurality of teran openmg, thefem; minal assembly means being accessible through eac h of sald wlre wrap termmal means comm-15mg said plurality of recessed chambers, and with said an internally threaded weld nut and a wire wrap wire wrap pin of said wire wrap terminal means of pin joined to said weld nut, said weld nut being Sal-d at least some of Said plurality of terminal received in said opening in said laterallyoffset arm sembly means extending theough Said opening in for "fierconnecuqasald wrap temlmal means said plurality of recessed chambers and projecting to said prongreceivmg terminal means; and outwardly from the rear of the corresponding one means fastenmg Said plurality of tel'mmal assembly of said plurality of base receptacles at substantially means to said plurality of base receptacles with right angles thereto;

Said Prong receiving Portion of Said Prong receiv' 3O 10. In a mounting system for static control including a mounting rail having a medial portion provided with an opening therein, and a base receptacle mounted to the mounting rail and including a top surface, a stem portion and a pair of outer opposite side portions, the

tacle for selectively making a wire connection improvement comprising: thereto and with Said Wire p P of said Wire a. terminal assembly means comprising prong receivwrap terminal means projecting outwardly from ing terminal means for receiving 3, prong of a logic the rear of said base receptacle and through said control unit and wire wrap terminal means for portions of said pair of said plurality of smaller making wire connections thereto; compartment-like openings on said medial portion 40 b. said prong receiving terminal means comprising a of said mounting rail to provide access for selecprong receiving portion and laterally offset arm tivcly making a back wire connection to said wire projecting outwardly from said prong receiving wrap pin; portion, said laterally offset arm having an opening 8. A mounting system for static control as set forth in therein; claim 7 wherein: c. said wire wrap terminal means comprising an ina. each of said plurality of base receptacles has a ternally threaded weld nut and a wire wrap pin cavity extending from said top surface down into joined to said weld nut, said weld nut being said stem portion; received in said opening in said laterally offset arm b. said stem portion has a plurality of openings exfor interconnecting said wire wrap terminal means tending through said stem portion and accessible to s p g receiving terminal means; and fr said vi and d. means fastening said terminal assembly means to at least some of said plurality of terminal assembly Said base r ceptacle With aid prong receiving pormeans for each of said plurality of base receptacles tion of Said Prong receiving terminal means are fastened in said plurality of openings in said cessible from the front of said base receptacle, and stem portion with said prong receiving portion of with said internally threaded weld nut of said wire said prong receiving terminal means of said at least T p terminal means aCceSSiblF from f frompf some of said plurality of terminal assembly means Said receptacle for y a and said weld nut of said wire wrap terminal means cqnneqlon thereto i wlth 531d p P of of said at least some of said plurality of terminal aswlre wrap termmal l prolectmg sembly means being accessible through said cavity, wardly from the rear of Sam base receptacle to provide access for selectively making a back wired connection to said wire wrap pin. 

1. A mounting system for static control comprising: a. a mounting rail comprising an elongated member, said elongated member including a medial portion, said medial portion having an opening therein; b. at least one base receptacle mounted to said mounting rail, said base receptacle including a top surface, a stem portion and a pair of outer opposite side portions; c. terminal assembly means comprising prong receiving terminal means for receiving a prong of a logic control unit and wire wrap terminal means for making wire connections thereto; d. said prong receiving terminal means comprising a prong receiving portion and a laterally offset arm projecting outwardly from said prong receiving portion, said laterally offset arm having an opening therein; e. said wire wrap terminal means comprising a weld nut and a wire wrap pin joined to said weld nut, said weld nut being received in said opening in said laterally offset arm for interconnecting said wire wrap terminal means to said prong receiving terminal means; f. means fastening said terminal assembly means to said base receptacle with said prong receiving portion of said prong receiving terminal means accessible from the front of said base receptacle, and with said weld nut of said wire wrap terminal means accessible from the front of said base receptacle and with said wire wrap pin of said wire wrap terminal means projecting outwardly from the rear of said base receptacle; and g. said wire wrap pin of said wire wrap terminal means extending through said opening in said medial portion of said mounting rail when said base receptacle is mounted to said mounting rail in order to provide access to said wire wrap pin from the rear of said base receptacle and of said mounting rail for making a back wired connection to said wire wrap pin.
 2. A mounting system for static control as set forth in claim 1 wherein: a. said base receptacle has a cavity extending from said top surface down into said stem portion; b. said stem portion has at least one opening extending entirely through said stem portion and accessible from said cavity; and c. said terminal assembly means is fastened in said opening in said stem portion of said base receptacle with said prong receiving portion of said prong receiving terminal means and said weld nut of said wire wrap terminal means being accessible through said cavity, and with said wire wrap pin extending through said opening in said stem portion and projecting outwardly from the rear of said stem portion at substantially right angles thereto.
 3. A mounting system for static control as set forth in claim 1 wherein: a. said base receptacle includes at least one recessed chamber formed in at least one of said pair of outer opposite side portions; b. said recessed chamber has an opening extending from said recessed chamber entirely through said base receptacle; and c. said terminal assembly means is fastened in said opening in said recessed chamber of said base receptacle with said prong receiving portion of said Prong receiving terminal means and said weld nut of said wire wrap terminal means being accessible through said recessed chamber and with said wire wrap pin extending through said opening in said recessed chamber and projecting outwardly from the rear of said base receptacle at substantially right angles thereto.
 4. A mounting system for static control comprising: a. a mounting rail comprising an elongated member, said elongated member including a substantial U-shaped medial portion; b. said medial portion having an opening therein extending substantially the entire length and width of said medial portion, said medial portion including a plurality of projections arranged in spaced opposed relation along a pair of opposing sides of said opening and extending inwardly into said opening to divide said opening into a plurality of smaller compartment-like openings; c. at least one base receptacle, said base receptacle including a top surface, a stem portion, and a pair of outer opposite side portions; d. said base receptacle and at least some of said plurality of projections on said medial portion including receiver means for receiving mounting means for mounting said base receptacle to said medial portion of said mounting rail, said base receptacle being mounted in juxtaposed relation to portions of a pair of said plurality of smaller compartment-like openings on said medial portion; e. a plurality of terminal assembly means, each of said terminal assembly means comprising prong receiving terminal means for receiving a prong of a logic control unit and wire wrap terminal means for making wire connections thereto; f. each of said prong receiving terminal means comprising a prong receiving portion and a laterally offset arm projecting outwardly from said prong receiving portion, said laterally offset arm having an opening therein; g. each of said wire wrap terminal means comprising a weld nut and a wire wrap pin joined to said weld nut, said weld nut being received in said opening in said laterally offset arm for interconnecting said wire wrap terminal means to said prong receiving terminal means; and h. means fastening said plurality of terminal assembly means to said base receptacle with said prong receiving portion of said prong receiving terminal means accessible from the front of said base receptacle, and with said weld nut of said wire wrap terminal means accessible from the front of said base receptacle and with said wire wrap pin of said wire wrap terminal means projecting outwardly from the rear of said base receptacle and through said portions of said pair of said plurality of smaller compartment-like openings on said medial portion of said mounting rail to provide access for making a back wired connection to said wire wrap pin.
 5. A mounting system for static control as set forth in claim 4 wherein: a. said base receptacle has a cavity extending from said top surface down into said stem portion; b. said stem portion has a plurality of openings extending through said stem portion and accessible from said cavity; and c. at least some of said plurality of terminal assembly means are fastened in said plurality of openings in said stem portion of said base receptacle with said prong receiving portion of said prong receiving terminal means of said at least some of said plurality of terminal assembly means and said weld nut of said wire wrap terminal means of said at least some of said plurality of terminal assembly means being accessible through said cavity, and with said wire wrap pin of said wire wrap terminal means of said at least some of said plurality of terminal assembly means extending through a corresponding one of said plurality of openings in said stem portion and projecting outwardly from the rear of said stem portion at substantially right angles thereto.
 6. A mounting system for static control as set forth in claim 4 wherein: a. said base receptacle includes a plurality of recessed chambers fOrmed in said pair of outer opposite side portions; b. each of said plurality of recessed chambers has an opening extending from said recessed chamber entirely through said base receptacle; and c. at least some of said plurality of terminal assembly means are fastened in said opening of said plurality of recessed chambers of said base receptacle with said prong receiving portion of said prong receiving terminal means of said at least some of said plurality of terminal assembly means and said weld nut of said wire wrap terminal means of said at least some of said plurality of terminal assembly means being accessible through said plurality of recessed chambers, and with said wire wrap pin of said wire wrap terminal means of said at least some of said plurality of terminal assembly means extending through said opening in said plurality of recessed chambers and projecting outwardly from the rear of said base receptacle at substantially right angles thereto.
 7. A mounting system for static control comprising: a. a mounting rail comprising an elongated member, said elongated member including a substantially U-shaped medial portion; b. said medial portion having an opening therein extending substantially the entire length and width of said medial portion, said medial portion including a plurality of projections arranged in spaced opposed relation along a pair of opposing sides of said opening and extending inwardly into said opening to divide said opening into a plurality of smaller compartment-like openings; c. a plurality of base receptacles, each of said base receptacles including a top surface, a stem portion, and a pair of outer opposite side portions; d. each of said plurality of base receptacles and each of said plurality of projections on said medial portion including receiver means for receiving mounting means for mounting said plurality of base receptacles to said medial portion of said mounting rail, each of said plurality of base receptacles being mounted in juxtaposed relation to portions of a pair of said plurality of smaller compartment-like openings on said medial portion; e. a plurality of terminal assembly means for each of said plurality of base receptacles, each of said plurality of terminal assembly means comprising prong receiving terminal means for receiving a prong of a logic control unit and wire wrap terminal means for making wire connections thereto; f. each of said prong receiving terminal means comprising a prong receiving portion and a laterally offset arm projecting outwardly from said prong receiving portion, said laterally offset arm having an opening therein; g. each of said wire wrap terminal means comprising an internally threaded weld nut and a wire wrap pin joined to said weld nut, said weld nut being received in said opening in said laterally offset arm for interconnecting said wire wrap terminal means to said prong receiving terminal means; and h. means fastening said plurality of terminal assembly means to said plurality of base receptacles with said prong receiving portion of said prong receiving terminal means accessible from the front of said base receptacles, and with said internally threaded weld nut of said wire wrap terminal means accessible from the front of said base receptacle for selectively making a wire connection thereto and with said wire wrap pin of said wire wrap terminal means projecting outwardly from the rear of said base receptacle and through said portions of said pair of said plurality of smaller compartment-like openings on said medial portion of said mounting rail to provide access for selectively making a back wire connection to said wire wrap pin.
 8. A mounting system for static control as set forth in claim 7 wherein: a. each of said plurality of base receptacles has a cavity extending from said top surface down into said stem portion; b. said stem portion has a plurality of openings extending through said stem portion and accessible from said cavity; anD c. at least some of said plurality of terminal assembly means for each of said plurality of base receptacles are fastened in said plurality of openings in said stem portion with said prong receiving portion of said prong receiving terminal means of said at least some of said plurality of terminal assembly means and said weld nut of said wire wrap terminal means of said at least some of said plurality of terminal assembly means being accessible through said cavity, and with said wire wrap pin of said wire wrap terminal means of said at least some of said plurality of terminal assembly means extending through a corresponding one of said plurality of openings in said stem portion and projecting outwardly from the rear of said stem portion at substantially right angles thereto.
 9. A mounting system for static control as set forth in claim 7 wherein: a. each of said plurality of base receptacles includes a plurality of recessed chambers formed in said pair of outer opposite side portions; b. each of said plurality of recessed chambers has an opening extending from said recessed chamber entirely through said base receptacle; and c. at least some of said plurality of terminal assembly means for each of said plurality of base receptacles are fastened in said opening of said plurality of recessed chambers with said prong receiving portion of said prong receiving terminal means of said at least some of said plurality of terminal assembly means and said weld nut of said wire wrap terminal means of said at least some of said plurality of terminal assembly means being accessible through said plurality of recessed chambers, and with said wire wrap pin of said wire wrap terminal means of said at least some of said plurality of terminal assembly means extending theough said opening in said plurality of recessed chambers and projecting outwardly from the rear of the corresponding one of said plurality of base receptacles at substantially right angles thereto.
 10. In a mounting system for static control including a mounting rail having a medial portion provided with an opening therein, and a base receptacle mounted to the mounting rail and including a top surface, a stem portion and a pair of outer opposite side portions, the improvement comprising: a. terminal assembly means comprising prong receiving terminal means for receiving a prong of a logic control unit and wire wrap terminal means for making wire connections thereto; b. said prong receiving terminal means comprising a prong receiving portion and laterally offset arm projecting outwardly from said prong receiving portion, said laterally offset arm having an opening therein; c. said wire wrap terminal means comprising an internally threaded weld nut and a wire wrap pin joined to said weld nut, said weld nut being received in said opening in said laterally offset arm for interconnecting said wire wrap terminal means to said prong receiving terminal means; and d. means fastening said terminal assembly means to said base receptacle with said prong receiving portion of said prong receiving terminal means accessible from the front of said base receptacle, and with said internally threaded weld nut of said wire wrap terminal means accessible from the front of said base receptacle for selectively making a wire connection thereto and with said wire wrap pin of said wire wrap terminal means projecting outwardly from the rear of said base receptacle to provide access for selectively making a back wired connection to said wire wrap pin. 